Centrifugal casting device

Abstract

A centrifugal casting device adapted to mold and cast a casting material melted by a casting material melting means, by the centrifugal force of a rotary arm, in a mold disposed on the centrifugal side of the arm through a casting crucible disposed at one end of the arm, in which device the melting means is designed to move outside the path of rotation of the arm at least when the arm is rotated so as to reduce the force of rotation of the arm to thereby increase efficiency of casting. And also a centrifugal casting device having the above features in which device the righting reaction of a charged compression spring is used as the driving force of the rotary arm and further included a clutch member and sensors so that the rotary arm stops as soon as possible at the end of casting and returns automatically to its normal position after stopping so as to be ready for the next step of casting and so as to automatically keep the force of rotation of the arm invariably constant.

I claim: 
     
       1. A centrifugal casting device comprising a rotary driving shaft, a rotary arm mounted at an end of said shaft and turning around an axis of the shaft by driving force of the shaft, a balance weight adjustably mounted at a first end side of the arm along an axial direction thereof, means for holding a crucible disposed at a second end of the arm for holding a casting crucible adapted to receive a melted material for casting therein, means for holding a mold connected to a centrifugal side of said means for holding a crucible, and means for melting casting material movably mounted so as to permit pouring of said melted material from said means for melting casting material into said casting crucible when said rotary arm is in an initial position and withdrawing of said means for melting casting material to a second position so as to lie outside a path of rotation of the arm at least when the rotary arm is rotated. 
     
     
       2. A centrifugal casting device according to claim 1 wherein means for melting casting material includes a detachable melting crucible inside the means for melting casting material. 
     
     
       3. A centrifugal casting device according to claim 1 wherein said melting means is designed to be a detachable split type melting means encircling said crucible holding means and a casting material is heated to melt by said melting means in the casting crucible held by the crucible holding means, and is cast by turning said rotary arm after having split said melting means and having retreated said melting means outside the path of rotation of the arm. 
     
     
       4. A centrifugal casting device comprising a rotary driving shaft, a rotary arm mounted at an end of said shaft and turning around an axis of the shaft by driving force of the shaft, a balance weight adjustably mounted at a first end of the arm along an axial direction thereof, means disposed at a second end of the arm for holding a casting crucible adapted to receive a melted material for casting therein, means for holding a mold connected to a centrifugal side of said means for holding a casting crucible, and means for melting casting material mounted so as to lie outside a path of rotation of the arm at least when the rotary arm is rotated, said device further comprising a means for driving said rotary arm which includes: a coil spring means fitted around the driving shaft and secured at a first end to the shaft and fixed at a second end to a driving wheel fitted around the shaft rotatably relative to the shaft;   a drive source connected to the driving wheel for urging said coil spring means in a direction of winding thereof;   a clutch pin resiliently mounted in parallel to the driving shaft by a compression spring so as to be freely movable in and out of the rotary arm;   a clutch member fixed to the shaft in position nearest to the arm and which, in a direction of rotation of the shaft, is adapted to come into contact with said clutch pin and to bring the shaft and the arm into cooperative rotation, but which, in a direction opposite to that of rotation, is adapted to retreat the clutch pin and slide over a top end of the pin;   a stopper for stopping the rotary arm in normal position;   a first sensor for detecting position of rotation of the shaft and setting a zero level of the arm; and   a second sensor for detecting rotated position of the driving wheel.   
     
     
       5. A centrifugal casting device according to claim 4 wherein said means for melting casting material includes a detachable melting crucible and is movably mounted so as to permit pouring of said melted material from said means for melting casting material into said casting crucible when said rotary arm is at said zero level and withdrawing of said means for melting casting material to a second position so as to lie outside the path of rotation of said rotary arm. 
     
     
       6. A centrifugal casting device according to claim 4 wherein said melting means is designed to be a detachable split type melting means encircling said crucible holding means and a casting material is heated to melt by said melting means in a casting crucible held by said crucible holding means, and is cast by turning said rotary arm after having split said melting means and having retreated said melting means outside the path of rotation of the arm. 
     
     
       7. A centrifugal casting device according to claim 4 wherein a governor plate slidably swinging along said rotary arm is mounted in the vicinity of said clutch pin, said plate being designed to be moved by the centrifugal force of said rotary arm to the centrifugal side thereof when the arm is rotated and to engage with said clutch pin to hold said pin in the retreated state thereof.